Abstract
This study focuses on the improvement of the efficiency of an absorption heat pump for high heating temperatures with ammonia-water as working pair, based on experimental investigations. For this purpose, the absorber and the solution heat exchanger are designed. Furthermore, a new generator assembly, consisting of a plate heat exchanger (PHX), a storage tank and a separator, is implemented in the absorption heat pump. In comparison to a vessel-type generator, the weight of the residential size absorption heat pump with a total heating power of about 20kW in OP1 was decreased from 300kg to 180kg. The ammonia filling quantity was also reduced from 15kg by at least 9.5kg compared to a vessel-type generator. Experimental investigations are carried out at different operating points where each operating point represents a specific loading condition in the building heating system. An efficiency up to COPh=1.42 is achieved. Even at challenging conditions like a low external evaporator inlet temperature of -10°C or a high external condensator outlet temperature of 63°C, a COPh of 1.10 and 1.05 respectively is reached. The solution heat exchanger is working excellently with an efficiency of 0.972<ηSHX<0.996. Furthermore, improvements like an integration of a condensate separator or an absorber with internal heat recovery are presented.
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